单词：PBX
PBX的用法和样例：
例句
- This facility is important in some PBX systems which use nonstandard lines that certain modems will interpret as a dead line.这种设备在某些专用小交换机系统中非常重要，这些系统用的是非标准线路，某些调制解调器会把它们当作死线路。
词汇搭配
- common battery pbx共电式用户小交换机...
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